In the winter with the windows up, you can have a soft spoken conversation or talk on a cell without any noise interference at 70 MPH.
This is with the Chevy 292 Inline 6, but no idea what the DB level is.
Before I got use to the Chevy 250 was in the process of ruining a starter because I tried to start the engine when it was already running because you couldn't hear it.
Mine are very low as you can have a soft spoken phone conversation on speaker in a 110.
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